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chromium/third_party/blink/web_tests/external/wpt/navigation-api/navigate-event/intercept-detach-multiple.html 

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="i" src="/common/blank.html"></iframe>
<script>
async_test(t => {
  window.onload = t.step_func(() => {
    let second_handler_run = false;
    i.contentWindow.navigation.onnavigate = e => {
      e.intercept({ handler() { i.remove(); }});
      e.intercept({ handler() { second_handler_run = true; }});
    };

    i.contentWindow.location.href = "#1";
    t.step_timeout(t.step_func_done(() => assert_true(second_handler_run)), 0);
  });
}, "event.intercept() throws if used on an event from a detached iframe");
</script>